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(2.5 × \(10^{-10}\) ) × (7 × \(10^{-6}\) )

First, simplify brackets. / Your problem should look like: 2.5 × \(10^{-10}\) × 7 × \(10^{-6}\)
Second, simplify. / Your problem should look like: 17.5 × \(10^{-10}\) × \(10^{-6}\)
Third, simplify exponent. / Your problem should look like: 17.5 × \(10^{-15}\)

Answer: B

your answer is b. 1.75*10^-15

:)

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